期刊
PHYSICAL REVIEW D
卷 96, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.023518
关键词
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资金
- European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie grant [690575]
- Science and Technology Facilities Council (STFC) [ST/L000385/1, ST/L000636/1]
- Royal Commission
- BIPAC
- COST (European Cooperation in Science and Technology) [CA15117]
- Science and Technology Facilities Council [ST/L000385/1, ST/L000636/1, ST/P000673/1, ST/P000681/1] Funding Source: researchfish
- STFC [ST/P000681/1, ST/L000636/1, ST/L000385/1, ST/P000673/1] Funding Source: UKRI
We consider gravitational waves from the point of view of both their production and their propagation in doubly coupled bigravity in the metric formalism. In bigravity, the two gravitons are coupled by a nondiagonal mass matrix and show birefrigence. In particular, we find that one of the two gravitons propagates with a speed which differs from one. This deviation is tightly constrained by both the gravitational Cerenkov effect and the energy loss of binary pulsars. When emitted from astrophysical sources, the Jordan frame gravitational wave, which is a linear combination of the two propagating gravitons, has a wave form displaying beats. The best prospect of detecting this phenomenon would come from nano-Hertz interferometric experiments.
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